It’s one thing for a movie to leave you wanting a sequel and quite another to make you wish you were watching that sequel instead. “Fantastic Four” the second attempt by Fox and the third by Hollywood in general to bring Marvel Comics’ popular superteam to the big screen offers glimmers of good things to come in its final moments, but only after the audience has slogged through yet another dispiriting origin story and yet another Earth-rescuing battle in a bland, CG-created nowhere land.